Remediator and preparation method thereof and restoration method for heavy metal contaminated soil thereby

Abstract

The invention discloses a remediator for restoration of heavy metal contaminated soil. The remediator is prepared from the following ingredients in parts by weight: 30 to 60 parts of biomass charcoal, 2 to 7 parts of calcium carbonate, 3 to 6 parts of dolomite, 4 to 6 parts of bentonite, 2 to 5 parts of wood vinegar and 0.2 to 1 part of trichoderma. The invention also discloses a restoration method for heavy metal contaminated soil, comprising the following steps of adding the remediator to the heavy metal contaminated soil after the soil is turned over; planting rape in the soil; detecting physical and chemical properties of the soil after harvesting the rape until the rape reaching the harvest period; and repeating the above procedure until the physical and chemical properties of the soil meet the requirements. Soil fertility is improved greatly and the degree of heavy metal pollution is reduced through the method of combining the prepared remediator for restoration of heavy metal contaminated soil with the rape cultivation. Meanwhile, the method is easy to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a remediation agent for heavy metal-contaminated soil, a preparation method thereof, and a method for remediating heavy metal-contaminated soil with the remediation agent. Background technique [0002] With the growth of population and the acceleration of industrialization, the pollution of industrial wastes, chemical fertilizers and pesticides is becoming more and more serious, and the quality of farmland soil is degrading day by day. Soil pollution has become one of the main problems that endanger the quality of the global environment and the survival and development of human beings. According to the survey results of soil pollution in my country, the rate of over-standard soil points in cultivated land is close to 20%, and more than 80% of the over-standard points are heavy metals. Soil heavy metal pollution has aroused the concern and attention of the who...

AI Technical Summary

Problems solved by technology

At present, many plants have been found to have a strong ability to accumulate multiple heavy metals at the same time, but most of the reported phytoremediation methods have insignificant effects, slow results, and unstable remediation effects, and are limited by climate and soil environment. , so that these plants have a limited accumulation of heavy metals, which limits their application

Moreover, most of the current hyperaccumulator plants have defects such as slow growth, small biomass, limited depth of root extension, metal selectivity, and low transfer rate of heavy metals from roots to shoots, resulting in low actual remediation efficiency and long remediation time. long

In addition, for most plants, excessive heavy metals in the soil can cause cell metabolism disorders and hinder normal plant growth and development

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